Posted by pete 23 on December 30, 2012 at 17:14:50 from (74.32.229.189):
In Reply to: Vacuum advance posted by David G on December 30, 2012 at 16:33:01:
I was always tempted to try a distributor with manifold vacuum advance on a tractor but it was just another one of my ideas that never seemed to provide the right opportunity. If you ever had a vacuum gauge on a tractor while it was actually working though, you would see that even loafing along on a light load the vacuum was usually pretty low and most vacuum advanced were fully retarded at about 8 inches of vacuum so I doubt if it would have done much for economy. Never know though. Now you could get into venturi vacuum advances also which is a whole different animal. The old flat head ford v-8 engines used that method. IH did a variation of that also on their latest large gasoline v-8 engines. Little vacuum chambers inside dist operating the advance off of venturi vacuum. The higher the rpm and greater the volume of air through venturi produced max vacuum, just opposite of manifold vacuum.
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